When seafood goes straight from the water to your local market – as it does on Julia’s island home-away-from-home in Stonington, Maine – resist the temptation to dress it up with fancy sauces or dips or lots of mayo and other gunk. Instead, let its essence of summer sing out loud and clear as Julia does in her aptly entitled Largely Undoctored Crab Salad recipe that she developed just for fun.